Friday, 10 April 2009

34 - Interruption: Ben Goldacre on Matthias Rath

This is an interruption to the previous series of blogs on reliability. I will continue with that - promise! - but for now, I wanted to include this to help it get maximum publicity.

I am not claiming in any way any rights on what is written below. It has been published under a Creative Commons licence, which means that I can publish what he's written, as long as it's in full, and given reference and credit. It's taken from his excellent website, Bad Science, which is well worth a long and in-depth read.

The story behind it is that Ben Goldacre recently got sued by a man named Matthias Rath. The lawsuit was dropped, and, in the words of BG, "I think this means I win." Because he was being sued, the chapter below couldn't be included in his new book Bad Science. It's now been included in the new paperback version, to which I have linked above, and published online for you all to read. And it's important.

Read on...

This is an extract from
BAD SCIENCE by Ben Goldacre
Published by Harper Perennial 2009.

You are free to copy it, paste it, bake it, reprint it, read it aloud,

as long as you don’t change it – including this bit –
so that people know that they can find more ideas for free at www.badscience.net

The Doctor Will Sue You Now

This chapter did not appear in the original edition of this book, because for fifteen months leading up to September 2008 the vitamin-pill entrepreneur Matthias Rath was suing me personally,and the Guardian, for libel. This strategy brought onlymixed success. For all that nutritionists may fantasise in public that any critic is somehow a pawn of big pharma, in private they would do well to remember that, like many my age who work in the public sector, I don’t own a flat. The Guardian generously paid for the lawyers, and in September 2008 Rath dropped his case, which had cost in excess of £500,000 to defend. Rath has paid £220,000 already, and the rest will hopefully follow.

Nobody will ever repay me for the endless meetings, the time off work, or the days spent poring over tables filled with endlessly cross-referenced court documents. On this last point there is, however, one small consolation, and I will spell it out as a cautionary tale: I now know more about Matthias Rath than almost any other person alive. My notes, references and witness statements, boxed up in the room where I am sitting right now, make a pile as tall as the man himself, and what I will write here is only a tiny fraction of the fuller story that is waiting to be told about him. This chapter, I should also mention, is available free online for anyone who wishes to see it.

Matthias Rath takes us rudely outside the contained, almost academic distance of this book. For the most part we’ve been interested in the intellectual and cultural consequences of bad science, the made-up facts in national newspapers, dubious academic practices in universities, some foolish pill-peddling, and so on. But what happens if we take these sleights of hand, these pill-marketing techniques, and transplant them out of our decadent Western context into a situation where things really matter?

In an ideal world this would be only a thought experiment. AIDS is the opposite of anecdote. Twenty-five million people have died from it already, three million in the last year alone, and 500,000 of those deaths were children. In South Africa it kills 300,000 people every year: that’s eight hundred people every day, or one every two minutes. This one country has 6.3 million people who are HIV positive, including 30 per cent of all pregnant women. There are 1.2 million AIDS orphans under the age of seventeen. Most chillingly of all, this disaster has appeared suddenly, and while we were watching: in 1990, just 1 per cent of adults in South Africa were HIV positive. Ten years later, the figure had risen to 25 per cent.

It’s hard to mount an emotional response to raw numbers, but on one thing I think we would agree. If you were to walk into a situation with that much death, misery and disease, you would be very careful to make sure that you knew what you were talking about. For the reasons you are about to read, I suspect that Matthias Rath missed the mark.

This man, we should be clear, is our responsibility. Born and raised in Germany, Rath was the head of Cardiovascular Research at the Linus Pauling Institute in Palo Alto in California, and even then he had a tendency towards grand gestures, publishing a paper in the Journal of Orthomolecular Medicine in 1992 titled ‘A Unified Theory of Human Cardiovascular Disease Leading the Way to the Abolition of this Disease as a Cause for Human Mortality’. The unified theory was high-dose vitamins.

He first developed a power base from sales in Europe, selling his pills with tactics that will be very familiar to you from the rest of this book, albeit slightly more aggressive. In the UK, his adverts claimed that ‘90 per cent of patients receiving chemotherapy for cancer die within months of starting treatment’, and suggested that three million lives could be saved if cancer patients stopped being treated by conventional medicine. The pharmaceutical industry was deliberately letting people die for financial gain, he explained. Cancer treatments were ‘poisonous compounds’ with ‘not even one effective treatment’. The decision to embark on treatment for cancer can be the most difficult that an individual or a family will ever take, representing a close balance between well-documented benefits and equally well-documented side-effects. Adverts like these might play especially strongly on your conscience if your mother has just lost all her hair to chemotherapy, for example, in the hope of staying alive just long enough to see your son speak. There was some limited regulatory response in Europe, but it was generally as weak as that faced by the other characters in this book. The Advertising Standards Authority criticised one of his adverts in the UK, but that is essentially all they are able to do. Rath was ordered by a Berlin court to stop claiming that his vitamins could cure cancer, or face a €250,000 fine.

But sales were strong, and Matthias Rath still has many supporters in Europe, as you will shortly see. He walked into South Africa with all the acclaim, self-confidence and wealth he had amassed as a successful vitamin-pill entrepreneur in Europe and America, and began to take out full-page adverts in newspapers.

‘The answer to the AIDS epidemic is here,’ he proclaimed. Anti-retroviral drugs were poisonous, and a conspiracy to kill patients and make money. ‘Stop AIDS Genocide by the Drugs Cartel’ said one headline. ‘Why should South Africans continue to be poisoned with AZT? There is a natural answer to AIDS.’ The answer came in the form of vitamin pills. ‘Multivitamin treatment is more effective than any toxic AIDS drug.’‘Multivitamins cut the risk of developing AIDS in half.’

Rath’s company ran clinics reflecting these ideas, and in 2005 he decided to run a trial of his vitamins in a township near Cape Town called Khayelitsha, giving his own formulation, VitaCell, to people with advanced AIDS. In 2008 this trial was declared illegal by the Cape High Court of South Africa. Although Rath says that none of his participants had been on anti-retroviral drugs, some relatives have given statements saying that they were, and were actively told to stop using them.

Tragically,Matthias Rath had taken these ideas to exactly the right place. Thabo Mbeki, the President of South Africa at the time, was well known as an ‘AIDS dissident’, and to international horror, while people died at the rate of one every two minutes in his country, he gave credence and support to the claims of a small band of campaigners who variously claim that AIDS does not exist, that it is not caused by HIV, that anti-retroviral medication does more harm than good, and so on.

At various times during the peak of the AIDS epidemic in South Africa their government argued that HIV is not the cause of AIDS, and that anti-retroviral drugs are not useful for patients. They refused to roll out proper treatment programmes, they refused to accept free donations of drugs, and they refused to accept grant money from the Global Fund to buy drugs.

One study estimates that if the South African national government had used anti-retroviral drugs for prevention and treatment at the same rate as the Western Cape province (which defied national policy on the issue), around 171,000 new HIV infections and 343,000 deaths could have been prevented between 1999 and 2007. Another study estimates that between 2000 and 2005 there were 330,000 unnecessary deaths, 2.2 million person years lost, and 35,000 babies unnecessarily born with HIV because of the failure to implement a cheap and simple mother-to-child-transmission prevention program.

Between one and three doses of an ARV drug can reduce transmission dramatically. The cost is negligible. It was not available. Interestingly, Matthias Rath’s colleague and employee, a South African barrister named Anthony Brink, takes the credit for introducing Thabo Mbeki to many of these ideas. Brink stumbled on the ‘AIDS dissident’ material in the mid-1990s, and after much surfing and reading, became convinced that it must be right. In 1999 he wrote an article about AZT in a Johannesburg newspaper titled ‘a medicine from hell’. This led to a public exchange with a leading virologist. Brink contacted Mbeki, sending him copies of the debate, and was welcomed as an expert. This is a chilling testament to the danger of elevating cranks by engaging with them.

In his initial letter of motivation for employment to Matthias Rath, Brink described himself as ‘South Africa’s leading AIDS dissident, best known for my whistle-blowing exposé of the toxicity and inefficacy of AIDS drugs, and for my political activism in this regard, which caused President Mbeki and Health Minister Dr Tshabalala-Msimang to repudiate the drugs in 1999’.

In 2000, the now infamous International AIDS Conference took place in Durban. Mbeki’s presidential advisory panel beforehand was packed with ‘AIDS dissidents’, including Peter Duesberg and David Rasnick. On the first day, Rasnick suggested that all HIV testing should be banned on principle, and that South Africa should stop screening supplies of blood for HIV. ‘If I had the power to outlaw the HIV antibody test,’ he said, ‘I would do it across the board.’When African physicians gave testimony about the drastic change AIDS had caused in their clinics and hospitals, Rasnick said he had not seen ‘any evidence’ of an AIDS catastrophe. The media were not allowed in, but one reporter from the Village Voice was present. Peter Duesberg, he said, ‘gave a presentation so removed from African medical reality that it left several local doctors shaking their heads’. It wasn’t AIDS that was killing babies and children, said the dissidents: it was the anti-retroviral medication.

President Mbeki sent a letter to world leaders comparing the struggle of the ‘AIDS dissidents’ to the struggle against apartheid. The Washington Post described the reaction at the White House: ‘So stunned were some officials by the letter’s tone and timing – during final preparations for July’s conference in Durban – that at least two of them, according to diplomatic sources, felt obliged to check whether it was genuine.’Hundreds of delegates walked out of Mbeki’s address to the conference in disgust, but many more described themselves as dazed and confused. Over 5,000 researchers and activists around the world signed up to the Durban Declaration, a document that specifically addressed and repudiated the claims and concerns – at least the more moderate ones – of the ‘AIDS dissidents’. Specifically, it addressed the charge that people were simply dying of poverty: The evidence that AIDS is caused by HIV-1 or HIV-2 is clearcut, exhaustive and unambiguous … As with any other chronic infection, various co-factors play a role in determining the risk of disease. Persons who are malnourished, who already suffer other infections or who are older, tend to be more susceptible to the rapid development of AIDS following HIV infection.

However, none of these factors weaken the scientific evidence that HIV is the sole cause of AIDS … Mother-to-child transmission can be reduced by half or more by short courses of antiviral drugs … What works best in one country may not be appropriate in another. But to tackle the disease, everyone must first understand that HIV is the enemy. Research, not myths, will lead to the development of more effective and cheaper treatments.

It did them no good. Until 2003 the South African government refused, as a matter of principle, to roll out proper antiretroviral medication programmes, and even then the process was half-hearted. This madness was only overturned after a massive campaign by grassroots organisations such as the Treatment Action Campaign, but even after the ANC cabinet voted to allow medication to be given, there was still resistance. In mid-2005, at least 85 per cent of HIV-positive people who needed anti-retroviral drugs were still refused them. That’s around a million people.

This resistance, of course, went deeper than just one man; much of it came from Mbeki’s Health Minister,Manto Tshabalala- Msimang. An ardent critic of medical drugs for HIV, she would cheerfully go on television to talk up their dangers, talk down their benefits, and became irritable and evasive when asked how many patients were receiving effective treatment. She declared in 2005 that she would not be ‘pressured’ into meeting the target of three million patients on anti-retroviral medication, that people had ignored the importance of nutrition, and that she would continue to warn patients of the sideeffects of anti-retrovirals, saying: ‘We have been vindicated in this regard.We are what we eat.’

It’s an eerily familiar catchphrase. Tshabalala-Msimang has also gone on record to praise the work of Matthias Rath, and refused to investigate his activities. Most joyfully of all, she is a staunch advocate of the kind of weekend glossy-magazine-style nutritionism that will by now be very familiar to you. The remedies she advocates for AIDS are beetroot, garlic, lemons and African potatoes. A fairly typical quote, from the Health Minister in a country where eight hundred people die every day from AIDS, is this: ‘Raw garlic and a skin of the lemon – not only do they give you a beautiful face and skin but they also protect you from disease.’ South Africa’s stand at the 2006 World AIDS Conference in Toronto was described by delegates as the ‘salad stall’. It consisted of some garlic, some beetroot, the African potato, and assorted other vegetables. Some boxes of anti-retroviral drugs were added later, but they were reportedly borrowed at the last minute from other conference delegates.

Alternative therapists like to suggest that their treatments and ideas have not been sufficiently researched. As you now know, this is often untrue, and in the case of the Health Minister’s favoured vegetables, research had indeed been done, with results that were far from promising. Interviewed on SABC about this, Tshabalala-Msimang gave the kind of responses you’d expect to hear at any North London dinner-party discussion of alternative therapies.

First she was asked about work from the University of Stellenbosch which suggested that her chosen plant, the African potato, might be actively dangerous for people on AIDS drugs. One study on African potato in HIV had to be terminated prematurely, because the patients who received the plant extract developed severe bone-marrow suppression and a drop in their CD4 cell count – which is a bad thing – after eight weeks. On top of this, when extract from the same vegetable was given to cats with Feline Immunodeficiency Virus, they succumbed to full-blown Feline AIDS faster than their non-treated controls. African potato does not look like a good bet.

Tshabalala-Msimang disagreed: the researchers should go back to the drawing board, and ‘investigate properly’. Why? Because HIV-positive people who used African potato had shown improvement, and they had said so themselves. If a person says he or she is feeling better, should this be disputed, she demanded to know, merely because it had not been proved scientifically? ‘When a person says she or he is feeling better, I must say “No, I don’t think you are feeling better”? “I must rather go and do science on you”?’ Asked whether there should be a scientific basis to her views, she replied: ‘Whose science?’

And there, perhaps, is a clue, if not exoneration. This is a continent that has been brutally exploited by the developed world, first by empire, and then by globalised capital. Conspiracy theories about AIDS and Western medicine are not entirely absurd in this context. The pharmaceutical industry has indeed been caught performing drug trials in Africa which would be impossible anywhere in the developed world. Many find it suspicious that black Africans seem to be the biggest victims of AIDS, and point to the biological warfare programmes set up by the apartheid governments; there have also been suspicions that the scientific discourse of HIV/AIDS might be a device, a Trojan horse for spreading even more exploitative Western political and economic agendas around a problem that is simply one of poverty.

And these are new countries, for which independence and self-rule are recent developments, which are struggling to find their commercial feet and true cultural identity after centuries of colonisation. Traditional medicine represents an important link with an autonomous past; besides which, anti-retroviral medications have been unnecessarily – offensively, absurdly – expensive, and until moves to challenge this became partially successful, many Africans were effectively denied access to medical treatment as a result.

It’s very easy for us to feel smug, and to forget that we all have our own strange cultural idiosyncrasies which prevent us from taking up sensible public-health programmes. For examples,we don’t even have to look as far as MMR. There is a good evidence base, for example, to show that needle-exchange programmes reduce the spread of HIV, but this strategy has been rejected time and again in favour of ‘Just say no.’ Development charities funded by US Christian groups refuse to engage with birth control, and any suggestion of abortion, even in countries where being in control of your own fertility could mean the difference between success and failure in life, is met with a cold, pious stare. These impractical moral principles are so deeply entrenched that Pepfar, the US Presidential Emergency Plan for AIDS Relief, has insisted that every recipient of international aid money must sign a declaration expressly promising not to have any involvement with sex workers.

We mustn’t appear insensitive to the Christian value system, but it seems to me that engaging sex workers is almost the cornerstone of any effective AIDS policy: commercial sex is frequently the ‘vector of transmission’, and sex workers a very high-risk population; but there are also more subtle issues at stake. If you secure the legal rights of prostitutes to be free from violence and discrimination, you empower them to demand universal condom use, and that way you can prevent HIV from being spread into the whole community. This is where science meets culture. But perhaps even to your own friends and neighbours, in whatever suburban idyll has become your home, the moral principle of abstinence from sex and drugs is more important than people dying of AIDS; and perhaps, then, they are no less irrational than Thabo Mbeki.

So this was the situation into which the vitamin-pill entrepreneur Matthias Rath inserted himself, prominently and expensively, with the wealth he had amassed from Europe and America, exploiting anti-colonial anxieties with no sense of irony, although he was a white man offering pills made in a factory abroad. His adverts and clinics were a tremendous success. He began to tout individual patients as evidence of the benefits that could come from vitamin pills – although in reality some of his most famous success stories have died of AIDS. When asked about the deaths of Rath’s star patients, Health Minister Tshabalala-Msimang replied: ‘It doesn’t necessarily mean that if I am taking antibiotics and I die, that I died of antibiotics.’

She is not alone: South Africa’s politicians have consistently refused to step in, Rath claims the support of the government, and its most senior figures have refused to distance themselves from his operations or to criticise his activities. Tshabalala-Msimang has gone on the record to state that the Rath Foundation ‘are not undermining the government’s position. If anything, they are supporting it.’

In 2005, exasperated by government inaction, a group of 199 leading medical practitioners in South Africa signed an open letter to the health authorities of the Western Cape, pleading for action on the Rath Foundation. ‘Our patients are being inundated with propaganda encouraging them to stop life-saving medicine,’ it said. ‘Many of us have had experiences with HIV infected patients who have had their health compromised by stopping their anti-retrovirals due to the activities of this Foundation.’ Rath’s adverts continue unabated. He even claimed that his activities were endorsed by huge lists of sponsors and affiliates including the World Health Organization, UNICEF and UNAIDS. All have issued statements flatly denouncing his claims and activities. The man certainly has chutzpah.

His adverts are also rich with detailed scientific claims. It would be wrong of us to neglect the science in this story, so we should follow some through, specifically those which focused on a Harvard study in Tanzania. He described this research in full-page advertisements, some of which have appeared in the New York Times and the Herald Tribune. He refers to these paid adverts, I should mention, as if he had received flattering news coverage in the same papers. Anyway, this research showed that multivitamin supplements can be beneficial in a developing world population with AIDS: there’s no problem with that result, and there are plenty of reasons to think that vitamins might have some benefit for a sick and frequently malnourished population.

The researchers enrolled 1,078 HIV-positive pregnant women and randomly assigned them to have either a vitamin supplement or placebo. Notice once again, if you will, that this is another large, well-conducted, publicly funded trial of vitamins, conducted by mainstream scientists, contrary to the claims of nutritionists that such studies do not exist.

The women were followed up for several years, and at the end of the study, 25 per cent of those on vitamins were severely ill or dead, compared with 31 per cent of those on placebo. There was also a statistically significant benefit in CD4 cell count (a measure of HIV activity) and viral loads. These results were in no sense dramatic – and they cannot be compared to the demonstrable life-saving benefits of anti-retrovirals – but they did show that improved diet, or cheap generic vitamin pills, could represent a simple and relatively inexpensive way to marginally delay the need to start HIV medication in some patients.

In the hands of Rath, this study became evidence that vitamin pills are superior to medication in the treatment of HIV/AIDS, that anti-retroviral therapies ‘severely damage all cells in the body – including white blood cells’, and worse, that they were ‘thereby not improving but rather worsening immune deficiencies and expanding the AIDS epidemic’. The researchers from the Harvard School of Public Health were so horrified that they put together a press release setting out their support for medication, and stating starkly, with unambiguous clarity, that Matthias Rath had misrepresented their findings. Media regulators failed to act.

To outsiders the story is baffling and terrifying. The United Nations has condemned Rath’s adverts as ‘wrong and misleading’. ‘This guy is killing people by luring them with unrecognised treatment without any scientific evidence,’ said Eric Goemaere, head of Médecins sans Frontières SA, a man who pioneered anti-retroviral therapy in South Africa. Rath sued him.

It’s not just MSF who Rath has gone after. He has also brought time-consuming, expensive, stalled or failed cases against a professor of AIDS research, critics in the media and others.

His most heinous campaign has been against the Treatment Action Campaign. For many years this has been the key organisation campaigning for access to anti-retroviral medication in South Africa, and it has been fighting a war on four fronts. Firstly, it campaigns against its own government, trying to compel it to roll out treatment programmes for the population. Secondly, it fights against the pharmaceutical industry, which claims that it needs to charge full price for its products in developing countries in order to pay for research and development of new drugs – although, as we shall see, out of its $550 billion global annual revenue, the pharmaceutical industry spends twice as much on promotion and admin as it does on research and development. Thirdly, it is a grassroots organisation, made up largely of black women from townships who do important prevention and treatment-literacy work on the ground, ensuring that people know what is available, and how to protect themselves. Lastly, it fights against people who promote the type of information peddled by Matthias Rath and his like. Rath has taken it upon himself to launch a massive campaign against this group. He distributes advertising material against them, saying ‘Treatment Action Campaign medicines are killing you’ and ‘Stop AIDS genocide by the drug cartel’, claiming – as you will guess by now – that there is an international conspiracy by pharmaceutical companies intent on prolonging the AIDS crisis in the interests of their own profits by giving medication that makes people worse. TAC must be a part of this, goes the reasoning, because it criticises Matthias Rath. Just like me writing on Patrick Holford or Gillian McKeith, TAC is perfectly in favour of good diet and nutrition. But in Rath’s promotional literature it is a front for the pharmaceutical industry, a ‘Trojan horse’ and a ‘running dog’. TAC has made a full disclosure of its funding and activities, showing no such connection: Rath presented no evidence to the contrary, and has even lost a court case over the issue, but will not let it lie. In fact he presents the loss of this court case as if it was a victory.

The founder of TAC is a man called Zackie Achmat, and he is the closest thing I have to a hero. He is South African, and coloured, by the nomenclature of the apartheid system in which he grew up.At the age of fourteen he tried to burn down his school, and you might have done the same in similar circumstances. He has been arrested and imprisoned under South Africa’s violent, brutal white regime, with all that entailed. He is also gay, and HIV-positive, and he refused to take anti-retroviral medication until it was widely available to all on the public health system, even when he was dying of AIDS, even when he was personally implored to save himself by Nelson Mandela, a public supporter of anti-retroviral medication and Achmat’s work.

And now, at last, we come to the lowest point of this whole story, not merely for Matthias Rath’s movement, but for the alternative therapy movement around the world as a whole. In 2007, with a huge public flourish, to great media coverage, Rath’s former employee Anthony Brink filed a formal complaint against Zackie Achmat, the head of the TAC. Bizarrely, he filed this complaint with the International Criminal Court at The Hague, accusing Achmat of genocide for successfully campaigning to get access to HIV drugs for the people of South Africa.

It’s hard to explain just how influential the ‘AIDS dissidents’ are in South Africa. Brink is a barrister, a man with important friends, and his accusations were reported in the national news media – and in some corners of the Western gay press – as a serious news story. I do not believe that any one of those journalists who reported on it can possibly have read Brink’s indictment to the end.

I have.

The first fifty-seven pages present familiar anti-medication and ‘AIDS-dissident’ material. But then, on page fifty-eight, this ‘indictment’ document suddenly deteriorates into something altogether more vicious and unhinged, as Brink sets out what he believes would be an appropriate punishment for Zackie. Because I do not wish to be accused of selective editing, I will now reproduce for you that entire section, unedited, so you can see and feel it for yourself.

image

image

The document was described by the Rath Foundation as ‘entirely valid and long overdue’. This story isn’t about Matthias Rath, or Anthony Brink, or Zackie Achmat, or even South Africa. It is about the culture of how ideas work, and how that can break down. Doctors criticise other doctors, academics criticise academics, politicians criticise politicians: that’s normal and healthy, it’s how ideas improve. Matthias Rath is an alternative therapist, made in Europe.He is every bit the same as the British operators that we have seen in this book. He is from their world.

Despite the extremes of this case, not one single alternative therapist or nutritionist, anywhere in the world, has stood up to criticise any single aspect of the activities of Matthias Rath and his colleagues. In fact, far from it: he continues to be fêted to this day. I have sat in true astonishment and watched leading figures of the UK’s alternative therapy movement applaud Matthias Rath at a public lecture (I have it on video, just in case there’s any doubt). Natural health organisations continue to defend Rath. Homeopaths’ mailouts continue to promote his work. The British Association of Nutritional Therapists has been invited to comment by bloggers, but declined. Most, when challenged, will dissemble. ‘Oh,’ they say, ‘I don’t really know much about it.’ Not one person will step forward and dissent.

The alternative therapy movement as a whole has demonstrated itself to be so dangerously, systemically incapable of critical self-appraisal that it cannot step up even in a case like that of Rath: in that count I include tens of thousands of practitioners, writers, administrators and more. This is how ideas go badly wrong. In the conclusion to this book, written before I was able to include this chapter, I will argue that the biggest dangers posed by the material we have covered are cultural and intellectual.

I may be mistaken.

This work is licenced under the Creative Commons Attribution-Non-Commercial-No Derivative Works License described here, you’re free to copy it wherever you like as long as you keep it whole, and do please point people back here to badscience.net so that if they like it, they know where to find more for free.

Monday, 26 January 2009

33 - My PhD - Part 2: Failure Logic

Having explained all about what reliability is, the problem is now how to apply it. We need to know how well systems such as computers, aeroplanes, ships, and so on, will perform in terms of reliability, but often it is far too expensive to find this out by experimentation. We cannot take a large representative sample and test them until they break, as the expense of this is far too prohibitive.

So what can we do? Well, instead of trying to directly find the reliability of the overall system, we consider that the failure of a system is actually due to the failure of the things which make up the system. We then use logic to break the system's failure down into the failures of the constituent components.

For instance, consider a computer. Someone who has no experience with computers turns it on, and your operating system (like Windows) summarily fails to appear on the screen. This, if you like, is the "top level" problem - the major issue which affects the user. If we had a think about how this might have happened, someone with slightly more computery knowledge might suggest the following things:
  1. The monitor isn't turned on
  2. The monitor isn't plugged in
  3. The computer isn't plugged in
  4. The monitor has failed
  5. The computer has failed
  6. The connection between the monitor and the computer has failed
  7. The electrical power supply to the computer's plug has failed
  8. Try turning it off and on again
Apart from the last suggestion, these are various things which would result in a computer not showing your OS. I think it's exhaustive, but maybe there are one or two things that I've missed. Any one of these things (each of which is known as an event) could cause the top level problem, as could any combination of them. This means that there is an "OR" relationship between the top level event and these events. The top event will happen if event 1 or event 2 or event 3, and so on, happens.

We can then apply the same principle to each of these events in turn. Before I move onto this, though, I just want to point out the other "relationship" between a set of events, similar the "OR" one I mentioned above. Consider the top event "Something sets on fire". For this to happen, some things need to happen together:
  1. There needs to be something to burn - natural gas, wood, plastic, anything that can be a fuel for the fire.
  2. There needs to be enough oxygen for the fuel to burn, but not so much that it can't burn (there can be too much oxygen for a fire)
  3. There needs to be a source of ignition - a match, a flame, a spark.
If any one these things is not in place, "something sets on fire" cannot happen. This means that there is an "AND" relationship between the top event and events 1 to 3: "Something sets on fire" if event 1 and event 2 and event 3 happen.

Usually using just these two relationships between events, we can break down a system's failure into the failures of smaller components of the system. If we were to do this using just words, as I have done so far, then this would become quite unwieldy. Thankfully, though, we have methods of presenting information on the failure of a system much more concisely. One of the most popular of these is a fault tree.

A fault tree is just an expression of the sort of logic that I have shown. It is made up of shapes which represent events and gates. An AND gate is shown by the first of the following symbols, while an OR gate is shown by the second of them:

Note the flat line at the bottom of the AND gate, and the curved one for the OR gate. The single line sticking out of the top of each gate links to the single higher-level event (such as the top events I mentioned earlier), while the several lines coming out of the bottom are for each of the inputting, lower-level events which are the causes of the top event.

The events themselves come in three types:
  • Top event - the overall problem which we are trying to solve. Examples include "car fails", "computer fails", "building collapses", and so on. There is only ever one of these in any fault tree. Shown as a rectangle with a description of the event inside.
  • Basic event - when we have broken the top event down into the combinations of smaller and smaller failures, and we reach the lowest level to which we wish to go, those at the lowest level are known as basic events. These are typically failures of small components. For the computer example, consider examples such as "processor fails", "memory chip fails", and so on. Note that these examples will themselves have smaller and smaller causes, such as overheating and so on, but we are not so interested in them as, for the common home user, once they know that a memory stick or a processor has failed, they will simply seek to replace it, without being too bothered about the nature or the cause of the failure. Shown as a circle with a description of the event inside.
  • Intermediate event - any event which combines basic or other intermediate events but is not the top event. Shown as a rectangle with a description of the event inside.
Using just these five simple symbols, we have a remarkably massive ability to explain the failure of a large system in terms of the small things which ultimately cause it. An example fault tree is shown below for the computer example:

(Click to embiggen it)

The triangle underneath "computer fails" is a symbol to indicate that the event there has lower causes, and they will be put on the fault tree, but I haven't got around to it yet/couldn't be arsed.
Apologies if the fault tree doesn't show up as well as I was hoping, but blame blogger.com for that.

To finish up, then, you've been shown how reliability engineers commonly use logical methods to break down a big problem into smaller and smaller problems, linked by OR and AND relationships. These are commonly displayed on Fault Trees, which have been explained to you (and if you don't understand them, it's your fault, not mine). If you want to read more, do some searching on google and read some articles. I'm not a library. Here's a fairly crap wikipedia article which doesn't explain them terribly well for the layman.

The next blog will explain some mathsy stuff about probabilities. What has been shown here is a qualitative method - we find the causes of a problem, but without assigning likelihoods to any of them. Fault trees provide a nifty quantitative method of finding the probability of the top event by using those of the basic events. Tune in whenever I write it for more interesting information on my current research and job!

Friday, 23 January 2009

32 - My PhD - Part 1: Reliability

I've not posted in ages. Sorry. Been stupidly busy with my PhD.

Because I get asked so much about it, I thought I'd try to provide here (in as many posts as it takes) an explanation of exactly what the hell I'm up to. And besides, it's my blog and I can do what I like. Plus, I have to try to prove that I'm not still obsessing about gays.

So, first things first: Reliability. This is the core, the centre, of my work and its application is quite important. Reliability is a property of an item, such as (drawing inspiration from those things immediately around me) a phone, computer, mug, and so on. If properly defined and investigated, it allows us engineers to assess how likely the phone, computer, oil tanker, spaceship, etc. is to fail after a given amount of time.

Now, for commercial companies that sell phones, computers, etc., it can be a part of the marketing: "Reliable" is a very good selling point for such things. For instance, if you knew that one specific computer in a shop was 99% likely to still be fully operational in five years' time, you'd probably be tempted to buy it over the other ones.

Hopefully you can see that reliability is just a probability that changes over time: while my computer has a 100% chance of working when I buy it, that probability reduces over time, so it could be 95% likely to work in a year's time, 90% in two years, and so on.

If the computer does fail, then we can take it to a shop and get it fixed. If we consider the life of a computer (assuming that I don't just get shot of it after the third time of failure!), then it is a cycle of working - failed - working - failed and so on. The proportion of the time that it spends in the "working" state over its lifetime is known as its availability. The amount of time it spends in the "failed" state over its lifetime is called - unsurprisingly - its unavailability.

You might think that all this is rather trivial and unimportant. Think, though, for a second, about computers, iPods, cameras, which are expensive items for the consumer to buy. They need confidence that the item they buy won't stop working within a month, which is why laws are in place to protect the consumer from this, and companies offer extended warranties. For spaceships, space agencies need confidence that the phenomenally expensive and complex systems they are sending into space won't just pack up before the mission has even got off the ground (fnar fnar). Commercial aircraft operators need to know how to maintain their aircraft so that they won't have 250 deaths splashed across the papers the next day, with all the accompanying bad publicity, wailing relatives and compensation claims. Military aircraft operators need to know how to maintain their aircraft so they will have 250 deaths splashed across the papers the next day. Reliability is very, very important in today's world.

If you still don't believe me, consider the incidences where things have gone wrong - Piper Alpha, Chernobyl for starters, but on smaller scales, the IBM Deathstar, summer Tube breakdowns, various rail accidents. Failures, and systems with high failure rates (that is, the expected number of failures in a given period of time), can have devastating consequences.

Finding out, then, the probability of a system failing after a given period of time is critical. If the reliability is of a good enough standard, then the system can be sold, bought, used, etc. with a high degree of confidence. Similarly, if a company proves that it has done everything reasonably in its power to reduce failures and the effects of those failures, then it cannot be prosecuted if things go wrong (although you might argue that if things go badly wrong, then it probably wasn't doing everything properly anyway).

"Risk" is a figure which combines both the probability of an incident happening, and the consequences of that incident. The two latter figures are quantified in some way and then multiplied together to give a value for risk. For instance, most problems associated with gasholders (terrible article alert) have a moderately high probability but would not cause any fatalities. The big problems (the whole damn thing blowing up, for instance) is very low-risk, has never happened in the UK, in fact, but has high consequences. As long as one figure is low when the other is high, the risk of anything will be quite low. Risk assessment, then, is a case of establishing likely values for the probability of an incident, and the consequences of it should it happen.

Finding out the various reliability figures for a system is not easy, though. It is always possible to find out the values through testing. Usually, thought, for things like computers, trains, spaceships, you can't just make a thousand units and test them all to destruction, and do statistics to find the answer. It's just far too expensive both in terms of time, resources and money. Because of this, we have to resort to less interesting measures of estimating system reliability, which is what I will share with you in the next blog.

Thursday, 18 December 2008

31 - I think I've found the funniest yootoob comment

There are members of my family and those in my wider social circle who actually read this blog, apparently. For the benefit of those people, I'd like to point out a site called YouTube. There are people who like to spend their time recording videos for the site, such as parodies and funny stories, just reciting (boring) anecdotes about their lives, and so on. Occasionally one comes across something which is actually rather good, such as this guy (no, it really is a guy, honest) crying about Britney "Mental" Spears - warning, lots of sweary-poos. The problem with YouTube, in the main, is that it allows people to say things.

So if one ever comes across a video, such as Adam Buxton's "Help the Police", and one scrolls through the comments, eventually one will get to flashes of insight such as

- thats sooooo ... gay the men gay the boy gay the women ähh bitch coz N.W.A NOT Firndly to police

- not to sound racist, but it has been scientifically proven that "white people" are, in fact, muchly more mentally evolved than african americans.

- F*** THE POLICE not help em. This is gay as hell.

I don't even want to talk about some of the comments on the video of Prince Charles and Princess Camilla's wedding, but I'm sure you get the idea. By the way, as a little aside, I'd just like to point out that Diana, POW, is dead. And I'm sure that as a result she doesn't care about Charles getting his end away with the woman he loves.

You do sometimes, however, come across some genuine insight, which is why I'm writing this blog. Some time ago I watched the Jools Holland show, and a chap called Yoav did a remarkable song, and I thus bought his album (I'm listening to it now). Having deleted the programme from our V+ box, I thought I'd look it up on choochoob and found it, here. And what did I see lurking in the comments below, on page 2?

hollowwitch (6 months ago)
Yes, he certainly is talented, which makes me mad because I'm not talented at all, but then I don't look like Louis theroux and he does. But then he may have a ten inch cock which would make me even madder!! Oh it's all too confusing, the guy's so talented he actually deserves a ten inch wanger. I hate him, he's great.


Best ever? I think so.

Friday, 24 October 2008

30 - Oh! The Horror! Oh! The Pain! The Trials and Tribulations of not caring about the Credit Crunch

I've tried, I really have, promise. But the thing is, I'm struggling. Every morning, I wake up and try to get myself to go along with it, to feel something in some way, but I just can't. It doesn't work. No matter how hard I try, to me, the Credit Crunch is just something that is happening to Other People. And as such, it classes as entertainment, rather than something to worry about.

The sheer amount of bullshit we have read in the last few weeks regarding this thing just boggles the mind. The newspapers are practically humping the credit crunch's leg... look, get off! Just fuck off you bloody thing! Oh no! Not tha... oh, you went and came on my jeans. Great job, you bollocks.

So the world is entering a recession. We're all doomed, the end of life as we know it, why don't we all just crawl into our respective corners and fucking well die?

Economics has always seemed to me half mathematical and half psychological (and I say this as someone with a good deal of knowledge about mathematical things, a lot of made-up nonsense on psychological things and almost no knowledge about economical things) - it's all well and good relying on your mathematical models, watching the numbers jump up and down on your little computer screen all day long, going for eight fag-breaks a day and swearing profusely at anyone who isn't you, but as soon as someone says the word "recession", everyone starts panicking, trying to sell all their shares because the short-term losses could literally make the world explode.

One of the causes of this, I feel, is that banking institutions typically employ bold, brash, volatile people who like to take risks. The problem with these sorts of people is that, sooner or later, enough of them will make too many bad mistakes at the same time and the whole thing goes tits up.

And let's have a think about the media for a second - for weeks now we've had it rammed down our necks that houses prices are going down, we're having a recession; banks are going bust, we're having a recession; shares are dropping, we're having a recession; house sales have stopped, we're having a recession; confidence is low, we're having a recession; shops are reporting massive sales drops, we're having a recession; Gas prices are going up, we're having a recession; etc. etc. ad infinitum. All of which feeds into that psychological dump in the financial industry and makes the whole thing worse. So, basically, the people responsible for the Credit Crunch are: American investment bankers, all other investment bankers in the entire world, politicians and journalists. So burn the fuckers.

Meanwhile, I'm going to enjoy being in a secure industry (oil and gas - people need them no matter what the prices, haha), with no pension, savings or mortgage, a contracted rent and low utility bills. And while I do so, I can watch the world convince itself to collapse.

Thursday, 23 October 2008

29 - More Gayness

Argh. I thought I'd add a quick blog here, partly because I feel slightly guilty at my very low recent post-rate, and also because I feel it's worth pointing out some more of my realisations about the Bible.

I recently got into a... let's call it a "debate" about homosexuality and the Church - deliberately - because I wanted to test out my views on my fellow twenty-somethings. We had just been at church down here in the Saaf, and had gone to the pub afterwards for a drink.

Firstly, I was astounded to hear that there are several people of my age who don't accept that gay people are naturally gay. It turns out that, as far as this issue is concerned, I am somewhat ahead of the race here. Study* of sexuality in identical twins, who share the same genes and DNA, shows many examples of one being hetero and one being homo, while also showing more condordance in homosexuality between identical twins (52% in one study) than non-identical twins (22%). Thus: homosexuality cannot be purely and simply down to genetics, but genes do play a non-negligible role. There are many other studies investigating many possible or plausible causes of homosexuality in humans, and from these there is, as yet, no definitive answer for what the causes are. Of note is the fact that as a woman gives birth to more and more males, the chances of each successive boy becoming gay increases the probability of his being gay by 33%.

Studies of home-video tape (or homo-video tape, ha ha) of children can often display young lads who enjoy playing with dolls and other "girly" things, or young girls who are destructive and noisy in their behaviour - these typically turn out to lead to homosexuality in later life.

The issue, then, is not anywhere near as clear as you or I would like it. Some people are very straight - testosterone or oestrogen practically bleeding from their ears - while some are very bisexual, while some are very gay, while some are slightly gay, while some are slightly straight, and so on. Some are utterly asexual. Whatever the causes of the sexuality in humans, people's sexuality is a natural thing - whichever way they swing or the angle of their swinginess.

Secondly, I was rather rubbish at trying to come up with a place where God's character contradicts something in the Bible. I can't remember how the train of conversation ended up in the weather of this particular shit-storm, but I think I got myself a bit muddled. From this, I was able to better lay out my thoughts, and I present them herewith:

There are certain laws in the Bible which are core expressions of who God is - You shall love the Lord your God..., You shall not murder, and so on. If the Holy Spirit were to appear to someone and tell them that these rules were no longer to be followed, it would change God's character - something we know cannot happen. However, there are also other laws which define how we are to live in order to please God at any one time, yet which do not define his character. I gave the example two blogs ago of the food thing - the Holy Spirit tells Peter that certain meats are now back on the menu despite their previous and long-lasting omission, and yet this doesn't ultimately redefine who God must be.

I feel that it is perfectly possible for God and the church to welcome, love, support and respect homosexual life-partners (or married couples, or whatever you call them) - i.e. for the rules to be changed by the Holy Spirit, which I feel He is calling us to do - without changing who God is defined as (love). I may be wrong, but I don't think I am. So ha.

*There are many references and sources in the Biology and Sexual Orientation article on Wikipedia.

Wednesday, 1 October 2008

28 - Marriage (the story so far...)

I sort of promised that I'd write this one. Not to my wife, bless her, who rules the vast proportion of my life with a golden rod (not iron - it's softer and far more expensive than that...). No, to my mate, Leigh, who was my best man when I got married back in May. He's a hotshot lawyer or solicitor-type person now, working in Central London, and he don't take no shit from nobody, foo'.

Leigh expressed some surprised that as of yet I haven't written about one of the most important things to have happened in my life: my wedding and subsequent marriage. So here it is. I've tried to assemble some thoughts on what it's like being married. I'm not an expert (only five six months now), but there are some interesting things about it which I can point out. As a little disclaimer, it should be noted that while I don't typically mince my words in this little interwebby prison of writings, my wife might actually read this, so I may have to, in certain places, be slightly more, erm, discreet than usual.

It's really, really good to be married. When I think about the six and a half years of being with my then-not-yet-wife, Christabel, and not being married, I think of it as being considerably harder and more painful than the five six months since the wedding. Christabel and I met while I was at uni in Loughborough, in December 2001. Christabel used to live at her parents' place in Chessington, Surrey, a journey of about 135 miles each way. Before I learnt to drive, I'd get the train down the Midland Mainline (or Christabel would come the other way), and we'd typically have Friday night through to Sunday afternoon together before parting ways, with a journey of four hours door-to-door. After learning to drive, in June 2006, it obviously got rather easier to get to and fro, but the pain lay in being forcibly separated again, even though we knew we should be together.

Our relationship was always long-distance before the wedding, and we used to worry about whether or not the jump from long to short-distance would be stupidly hard. To be honest, it wasn't, really. We've obviously had our little "exchanges" now and again: for instance, I didn't realise how vital it was that the window is opened in the morning to "air the room" whilst concurrently the heating is put on because "it's cold". Or that the bath-mat is placed neatly over the side of the bath after a shower. Or that if, for reasons beyond my control, breathing through my mouth or breathing through my nose both make too much noise whilst sleeping, I am expected to find a novel and instant way to get air into my lungs. Tracheotomy, for instance. And despite a promise to myself that I would never allow the old toilet-seat argument into my house, I'm afraid that it has reared its ugly head, as apparently it's unreasonable to expect her to "stare" at stale urine on the rim of the toilet while she brushes her teeth. As a result of these things, a "What Christabel Wants" list has been produced, so I can try to understand better what her previously unspoken, psychically-transmitted expectations were. A "What Sam Wants" list has sadly, thus far, remained unforthcoming.

All these things are incredibly minor, however, and I think add a lot of colour and richness to life. I actually sort of enjoy them, in a weird way, and are just an expression of a single level of the multi-storey relationship I have with my wife, that of housemates. And, purely as a housemate, I haven't lived with anyone I get on with better. We don't just live separate lives and then sleep in the same bed - we are always planning and doing things together. We sort out our differences and move on.

The other levels are varied. There's the will for us both to keep certain aspects of our lives as individuals - work life, for instance - separated, in a way. I will always try to ask her about my day, and I'll hear about all the people in her office and the nitty-gritty details of who said what to whom, who is crap and how someone bollocksed up an order for something. But I don't really have much idea of what she does. She'll ask me about my day. Typically I'll respond with a ten-second response indicating that very little has occurred, no one has said anything to anyone of interest, and unless the gasholder in Kennington explodes, there's very little to say. Nothing to report. The PhD then? Meh... still doing it. Going well. Met my deadline. Great. Nothing to report.

There's obviously another level that married couples have... which I'm not going to tell you about.

There's the spiritual level, which we fortunately are at a similar level on, where we both love God, submit to Him and try to live our lives in as loving and decent and hospitable a way as possible. There are many couples in the world who are imbalanced on a spiritual level, and I think it makes a chasm of difference. Whether you both start on one end of the scale or the other, it's important to be in the same place, and have the same desire to move on.

We do a vast amount of things together (and are frequently mocked for the "old-fashioned" nature of some of them), for instance joining the National Trust (which I recommend everyone do), our love of food and cooking, watching certain TV shows together and going on little adventures, to name but a few.

The best level of all, though, is the feeling of utter security and love, the feeling of having a partner to share everything with. Of knowing that someone else feels the same weird, complex, amazing, incomprehensible way about you that you do about them, and that they look forward to seeing you, that they miss you and love you in the same way, and that they understand you better than anyone else ever could. There is an amazing sense of strength through unity, and of growth, and freedom. Yes, freedom - not a word typically (from the male perspective) associated with marriage, but for me, being married has freed me up to do more things than I ever could before - I now have someone to do them with, to back me up and help me, or to support me if I do them by myself.

It's not often that you hear a bloke being honest about how good marriage has been for him - the usual British thing is to make a half-hearted joke about "'er indoors" or "t' ball and chain", and express their love thrice a year in birthday, mother's day and anniversary cards. Believe me, though: marriage is a good thing, and if you find someone who you think could make you happy for the rest of your life, you should do it.